enum CPNowPlayingButtonTypes {
  ///一个带图片的btn
  CPNowPlayingImageButton,
  ///+按钮
  CPNowPlayingAddToLibraryButton,
  ///...按钮
  CPNowPlayingMoreButton,
  ///0x按钮
  CPNowPlayingPlaybackRateButton,
  ///循环箭头按钮
  CPNowPlayingRepeatButton,
  ///交叉箭头（随机播放）按钮
  CPNowPlayingShuffleButton,
}
